ANALYSIS OF STEADY-STATE REACTION FRONTS IN A POROUS-MEDIUM

被引：5

作者：

ESCOBEDO, F ^{[1
]}

VILJOEN, HJ ^{[1
]}

机构：

[1] UNIV NEBRASKA,DEPT CHEM ENGN,LINCOLN,NE 68588

来源：

AICHE JOURNAL | 1993年 / 39卷 / 10期

关键词：

D O I：

10.1002/aic.690391011

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A pseudohomogeneous model is used to analyze the steady state of a sharp reaction front in a porous medium. The reaction rate is described by the flame sheet approximation, and an asymptotic matching analysis is used to determine the temperature, conversion and position of the reaction front. Both adiabatic and nonadiabatic operations are considered, and the effect of radiation is included in the adiabatic case. The results show that there exists a maximum molar flux before blowout occurs. The critical molar flux is decreased by higher activation energies, but it is increased by higher rate constants and flame temperatures. Radiation further stabilizes the flame against blowout. Expressions are provided for the flame temperature, reactant conversion and the conditions when blowout occur. It is also shown that under certain conditions the front has two steady-state positions.

引用

页码：1680 / 1686

页数：7

共 13 条

[1] REACTION FRONT PROPAGATION IN NONADIABATIC EXOTHERMIC REACTION FLOW SYSTEMS [J].